{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{6}{c}}
\hline\hline
          &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         &\multicolumn{1}{c}{(5)}         &\multicolumn{1}{c}{(6)}         \\
\hline
ST        &   -0.120\sym{*}  &   -0.172         &   -0.177\sym{**} &   -0.228\sym{*}  &    0.062         &    0.040         \\
          &  (0.073)         &  (0.137)         &  (0.077)         &  (0.131)         &  (0.110)         &  (0.150)         \\
ST\_ES2    &   -0.083         &   -0.181         &                  &                  &                  &                  \\
          &  (0.078)         &  (0.149)         &                  &                  &                  &                  \\
ST\_TL     &                  &                  &    0.106         &    0.026         &                  &                  \\
          &                  &                  &  (0.070)         &  (0.117)         &                  &                  \\
ST\_edu    &                  &                  &                  &                  &   -0.223\sym{*}  &   -0.298\sym{**} \\
          &                  &                  &                  &                  &  (0.118)         &  (0.138)         \\
\hline
\(N\)     &    10168         &     8948         &    10168         &     8948         &    10314         &     9074         \\
\(R^{2}\) &    0.066         &    0.057         &    0.066         &    0.057         &    0.067         &    0.058         \\
\hline\hline
\end{tabular}
}
